HPHE10266H045DVN American Water Heater 66 Gallon Residential Hybrid Electric Heat Pump Water Heater The Hybrid Electric heat pump water heater from American is the most cost effective energy-efficient option available for consumers who want to save money on their utility bills. How Do They Work?Absorb ambient heat from the surrounding air to heat water using a compressor and environmentally-friendly R134a refrigerantSelf-contained heat pump unit is integrated into the top of the tankMultiple operating modes to maximize efficiency and performance Features:ENERGY STAR® qualifiedMeets NEEA Tier 3 of the Advanced Water Heater Specification10-Year Limited Tank Warranty, 10-Year Parts Warranty, 1-Year Labor Warranty for Residential applicationsDual 4500 watt Copper sheathed backup heating elementsAdvanced electronic control system provides large LCD display for ease of use, precise temperature control and operational statusGlass-lined tank with CoreGard anode rod protects against corrosionEnvironmentally-Friendly Non-CFC foam insulationFactory-installed temperature & pressure (T&P) relief valve Four Operating Modes:Efficiency (heat pump onlyHybrid (heat pump plus electric)Electric (electric only)Vacation